Standardized extracts are those in which a compound or group of compounds are contained at a specific level, by weight. For Example, Carrubba’s Green Tea (90%) Polyphenols) Extract is guaranteed to be at least 90% total polyphenols by weight, and within that 90% total polyphenols, 46% will be EGCG (epigallocatechin-3-gallate). This standardization ensures you of receiving a known and constant amount of the compounds you’re looking for within each lot. Standardized extracts are generally in powdered form.